In Predictious, you can short sell, which means you can sell shares without owning them. You should do this when you think the market event will not happen (making the opposite prediction than those buying (long) shares of this contract, thinking the event will happen).
To sell a share follow these instructions. Note that if you later on want to exit your position, you will be able to buy back the shares you sold.
Here is how you're able to short sell without owning any shares: let's say you sell 1 share at m฿3.00. You receive a short share, as well as a m฿3. However, because we need to cover for potential losses, you also pay m฿10 in case your bet was wrong. If you win, we give you back the m฿10.00 deposit, so you made a m฿3 profit. However if you lose, we keep the m฿10 deposit, so you made a m฿7 loss.